Nano banana 3D city prompt 

"Hyper-realistic 3D square diorama of Istanbul, carved out with exposed soil cross-section beneath showing rocks, roots, and earth layers. Above: whimsical fairytale cityscape featuring iconic landmarks, architecture, and cultural elements of Istanbul. Modern white “Istanbul” label integrated naturally. Pure white studio background with soft natural lighting. DSLR photograph quality - crisp, vibrant, magical realism style. 1080x1080 dimensions"